Greg and jane left a 15% tip after dinner. the amount of the tip was $9. greg's dinner cost $24. which equation can you use to find x, the cost of jane's dinner?

Let x be the cost of Jane's meal as stated in the question.

Greg's dinner cost $24. Total cost of dinner = (x + 24)

Tip 15% of dinner cost.  Tip was $9.

15% of (x + 24) = 9

(15/100)*(x + 24) = 9

0.15*(x + 24) = 9.                That's the equation. Question answered.

But let's just go ahead and find x for the fun of it.

 
0.15*(x + 24) = 9.

(x + 24) = 9/0.15

(x + 24) = 60

x = 60 - 24

x = 36

x, which, Jane's dinner cost = $36.